Activate Yenna by paying ({2} magic symbol) and tapping it, creating a token copy of an Aura you control and a Food artifact token, then untapping Yenna and causing you to scry 2.
Activate Krark-Clan Ironworks by sacrificing the Food, adding ({C} magic symbol) ({C} magic symbol) .
Activate Thaumatog's second ability by sacrificing the Aura token, giving Thaumatog +1/+1 until end of turn.